Hey Alex,
I am a Senior Staff-level software engineer and Software Architect at Germany's (and Europe's) largest streaming platform.
We build on top of Kubernetes and Serverless offerings every day, with a platform serving millions of users every second.
While I can agree that the article might give only a limited view, I definitely think that I know my way around these worlds.
So to sum it up: I think I already know a lot, but might be able to do better in my articles. ;)
Cheers.